Under pick motion for looms



Sept. 6, 1949. HRD|NA 2,481,425

UNDER PICK MOTION FOR LOOMS Filed July 29, 1946 FIG. 1

FIG 3 Patented Sept. 6, 1949 UNDER PICK Mo'rIoNroR nooMs Rudolf Hrdina, Tyniste nad Orlici, Bohemia, I 1

Czechoslovakia Application July 29, 1946, Serial No. 681027 a In Czechoslovakia April 29,1946 1 3 Claims. (01. 139-148) I All the hitherto known mechanical pickmotion systems in looms are consisting of a plurality of members having the object of transmitting the energy from the rotating crankshaft on the shuttle driving member. The condition of attaining a very quick motion of the shuttle driving member which furthermore is oscillating together With the slay, results in the necessity of using more intricate bulky mechanisms which must'be' sized. on the one hand, in accordance with the considerable forces resulting from the transmission ratio and, on the other hand, in view of the contradictory consideration of the increase of the inertia .forces of the masses moving-at high speed. Thus .it is necessary to take into account an early wear and tear of the elements manufactured from the familiar materials. which again results in frequent repairs and resetting operations on the pick motion mechanism. A further drawback of the hitherto known designs of under pick motions is the excessive space they require so that they represent an essential obstacle e. g. for the preferable arrangement of dobbies which drawback is further combined with the lack of access to certain parts which is troublesome in the case of incidental repairs or the like, especially on looms already set for operation.

All the above mentioned drawbacks are eliminated in the arrangement of the under pick motion according to the present invention which moreover permits of setting the picker on the loom running.

The invention consists in that the driving ener y is admitted to the picking stick through a pickin shaft. this latter being provided in the lower third of the slay height above the floor and preferably passing directly through the axis of the oscillatin slay of the loom.

The picking shaft is provided with a cam and driven rotatably or pivotally through a transmission deriving from the main driving shaft of the loom. said cam being provided with an adjustable nose which on the performance of the picking motion is resting against one or more adjustable rollers.

For guiding the picking stick preferably a double-joint suspension is used, said suspension being together with said driving cam enclosed in a common casing.

The accompanying drawing illustrates diagrammatically, merely by way of example, one embodiment of the object of the present invention. i

Fig. 1 showing asection through the axis of the slay and under pickv motion mechanism;

Fig. 2 a side elevational view of this under pick motion mechanism the casing cover being removed;

Figs. 3 and 4 showing an elevational respectively plan view of the picking bowl with adjustable nose.v

Referring now to the figures, the sidewall l of the loom frame carries within the bearing 2 the pivotally arranged casing 3 the hollow pin 9 of which is keyedinto'the root of the slay 4. The picking stick 1 driving-the shuttle is attached by means of a pivot 15 toa rocking lever B supported by a pivot 8 within the casing 3. and it is mounted so as to slide on the guide block I l of the slotted link ll]: "Said block H is pivotally supported in the bearings of the casing 3 through a pivot 12. Said slotted link I0 is provided at the bottomwithapivot I 3 and a conical picking bowl l4 being in'engagement with the driving cam [5. The eccentric surface of this cam consists of two portions, viz. of the prevalently conical surface [6 provided directly on the cam body and of the nose I! attached thereto pivotally through a pivot 18. It is obvious that each time the bowl l4 meets the forwardly projecting nose l1 this motion results in a violent rocking of the stick 1 and thus causes picking.

At the remote side of the cam I5 a supporting roller 20 is arranged on an eccentric pivot l9 within a lug of the casing 3, the picking nose I! running with its rear surface unto this roller 20 when the picking occurs. By manually angular displacing said pivot 19 the picking nose I! may be more or less advanced to a forward position thus adjusting the "height of the tooth and thereby the force of the picking motion of the picking stick I. The cam I5 keyed on the picking shaft 2| is driven by means of a chain drive 22 deriving motion from the main driving shaft (crankshaft) of the loom, the ratio of the pinions being 1 to 2.

The casing 3 is intended to support all the pick motion members subjected to the greatest strain and which thus may run in an oil bath. In such case it is preferable to provide the top aperture of the casing for the picking stick I with the leather bellows to prevent detrimental dust entering the casing. Thereby the life of the pick motion elements is substantially prolonged and furthermore greater stresses are permitted which further allows of a compact design of the under pick motion mechanism preferable especially in the cases of heavy-duty automatic looms. Instead of a chain drive, gears and/or a rocking link may be used for the drive of the j picking shaft 2|. 7

It is further obvious that any other convenient suspension arrangement for the picking stick It may be used and other constructional details of said unde pi k motion may be widely modified bination with an oscillating slat-! lag-mating i picking shaft extending through the axis of km:

lation of said slay, a casing 'rotatably mounted on said picking shaft and keyedito said oscillat ing slay, a picking stick having a bowl *shaft tviiic'h extends into said casing, said cam engagingssaid picking bowl, and means for drivthereon, means for suspending said *pieldngstick' in said casing, a cam fixedly mounted mi end of said picking shaft which extends into said'c in said tam engaging saili zninlsin bow n adjustable nose onsaidcam'means adapted to manually adjust said 4105;; the oper tion of the 10cm, and means for driving said I picking shaft from the main shaft of loom.

In an under pick mtionior looms, the nombination with an oscillatinefislay, of a rotatin picking shaft extending through the oigsc ile iation of said slam a-sasingwtatably am s i picking haf andkeye'd tqsaid oscillating l y, a pickin s ink having a howl-there n, m ansrfor suspendingiaidjpioking stick said ca ing, a-cam fixedly monntedaon ne and .of aid piokingshai whichzextcms intosaidcasin said am enga ingasaid h wl; an adju table picking nosepn said $33 an eccenri ll r rotatahiy adin tahly-"monnted in said casing and adapted to engage rear isfa-ce of said picking nose and adjust thesame dining the rotation of said-cam, manually operable means accessible from the exterior of saidpasing Io:

Name 7 Date, 518,424 Paigev ;,,.n lie Apr, :1 189% 1,1724% Kelley=s..a Feb .l5, 1916 -l,3'l:2,9-i:6 Dreher raw-"bun- June a, 192.0 1,930,989 Bentley "mums"; Oct, 1!),l933

, maman mwnms 7 35 Number Conntry a Date r 1,933 Great Britain v.i. g 1859 V a 9,175 .7 Great Britain M, ,.l90.

19,0517 7 Great Britain 1889 r $78.03? franccglnnnrnu Auguzfi, 19155 .'-I1he ,tollowing references are 7 4 adjusting said eccentric roller while the loom is in operation, and means for driving said picking, shaft from the main shaft of the loom;

3. In an under'pick motion'for looms, the combination with an oscillating slay, of a rotating picking shaft extending through the axis of oscillation of said slay, a casing rotatably mounted onsaidgpieking shaft and keyed torsaid oscilla ing slay, a picking stick having a picking bowl I \thereon, a slotted link within said casing and a 1 suspended therein by means of a rocking lever, saidslotted link' being slidable on a guide block .piv tally snppprted in said casing by' a trans-' ygyse bearing pin, said picking stick and said picking bowl being attached to said slotted link,

1 cm fixedly-mounted on one end of said picking ing said picking shaftsfrom the main shaft of theloom r r o 'RUDOBF HRDINALQ YREFEEENGES 01min. 7

ofrecord in-the of thispatentz V V j "UNITED-STATES awrnms Number 

